The obvious mistake you are making is allowing her to express an opinion. This is a common mistake and can easily be recitified by shortening her rope, ensuring that she cannot cross the invisible boundary from the kitchen into the lounge.
If she does try and initiate a discussion as she hands you your dinner, simply turn around, close the door, and return to the sofa.
Once she has resumed silence, and you have finished your meal, she can then be tranferred to the bedroom to fulfil the rest of her duties.
